CHC PID

Description

To configure the variables for closed loop control. PID parameters can be set separately for both heating and cooling control.

Purpose

Configure the variables for closed loop control. PID parameters can be set separately for both heating and cooling control.

Mode

Configuration can be performed with the wizard Off-line or On-line.

Procedure

  1. Click the PID button on the left pane to open the PID Configuration page.
  2. Enter information into available fields.
  3. Click Commit to save the settings or Reset to revert to the last saved settings.
  4. Click Next to display the Wiring Configuration page or Back to display the Miscellaneous Configuration page.

Fields 

Name Definition
PID Cooling/Heating

Allows the algorithm control parameters to be configured.

  • Proportional band

This value is the temperature deviation between setpoint and space temperature, which causes the control output to modulate from 0% to 100% of full range. The variable can be set in the range 2 to 100DDC (3.6DDF to 180DDF), respectively 1.3 . 100DDC [2.3DDF to 180DDF] for P Control only.

  • Reset Time

This value is the integral reset time in the range 0 to 3200 sec. Setting the Integral constant to zero disables integral operation.

  • Derivative Time

This value is the derivative constant in the range 0 to 3200 sec. Setting the derivative constant to zero disables derivative operation.
Thermal Switching Band /PID Boost Cooling/Heating
  • Boost Temp

Allows a boost band to be set for normal PID operation and when using thermal actuators. The variables indicate a setpoint-space temperature deviation outside which the outputs are switched to full operation to act as a boost function when space temperature deviates significantly from the desired setpoint. This band also serves as a threshold for two-point switching of thermal actuators. The threshold can be set in the range 0 to 10DDC (7.2 to 180DDF). If the threshold is set to 0DDC, the boost function is disabled.

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